The Aurora was a phenomenon caused by storms of charged particles and solar rays interacting with the atmosphere. Marisa Coulter spent 3 months observing the Aurora on one of her expeditions to the North. The charged particles in the Aurora make the matter in one world thin, allowing one to see through it to other worlds.
- Northern Lights
- The Golden Compass (film)
- His Dark Materials (TV series), Series 1
- The Subtle Knife (Mentioned only)
- La Belle Sauvage (Mentioned only)